I had a medium Pelikan M400 nib reground to a cursive italic (and another to a stub which is a wonderful nib!)

Now the cursive italic nib has ink flow problems: it is skipping frequently at downstrokes and it developed a substantial dislike for smooth paper. It seems to work much better with ordinary copy paper and I have to write very very slowly but it still skips. Applying any pressure at all splits the tines and the ink flow is totally gone.

Had the pen filled with Lamy blue and this was a real pain. Switched to Waterman blue with minimal improvement.

I know this behaviour from Pelikan 400 vintage broad nibs (they are kind of stub nibs) and could fix it with closing the tines a bit and adjusting the feed closer to the nib. But the reground nib is worse than any vintage broad I had so far.

Any idea what I can do to improve the ink flow?
I am not enthusiastic about sending it back to the USA for adjustment

Well, after thinking of any possibilities left I came to the conclusion that the feeder must be the problem.

Pen was a Pelikan M400 ebay purchase. Didn't like the nib in the first place so it became a cursive italic. Obviously I really did not use it at all because the feeder was totally clogged with black ink (using it would have made it obvious) and it took some time of ultrasonic cleaning in combination with ammonia soaking to get the problem solved.

Now I have a sweet cursive italic nib